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Lowland Leopard Frog and Colorado River Toad Distribution and Habitat Use in the Greater Lower Colorado River Ecosystem 2013

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Lowland Leopard Frog and Colorado River Toad Distribution and Habitat Use in the Greater Lower Colorado River Ecosystem 2013 Lowland Leopard Frog and Colorado River Toad Distribution and Habitat Use in the Greater Lower Colorado River Ecosystem June 2014 Lower Colorado River Multi-Species Conservation Program Steering Committee Members Federal Participant Group California Participant Group Bureau of Reclamation California Department of Fish and Wildlife U.S. Fish and Wildlife Service City of Needles National Park Service Coachella Valley Water District Bureau of Land Management Colorado River Board of California Bureau of Indian Affairs Bard Water District Western Area Power Administration Imperial Irrigation District Los Angeles Department of Water and Power Palo Verde Irrigation District Arizona Participant Group San Diego County Water Authority Southern California Edison Company Arizona Department of Water Resources Southern California Public Power Authority Arizona Electric Power Cooperative, Inc. The Metropolitan Water District of Southern Arizona Game and Fish Department California Arizona Power Authority Central Arizona Water Conservation District Cibola Valley Irrigation and Drainage District Nevada Participant Group City of Bullhead City City of Lake Havasu City Colorado River Commission of Nevada City of Mesa Nevada Department of Wildlife City of Somerton Southern Nevada Water Authority City of Yuma Colorado River Commission Power Users Electrical District No. 3, Pinal County, Arizona Basic Water Company Golden Shores Water Conservation District Mohave County Water Authority Mohave Valley Irrigation and Drainage District Native American Participant Group Mohave Water Conservation District North Gila Valley Irrigation and Drainage District Hualapai Tribe Town of Fredonia Colorado River Indian Tribes Town of Thatcher Chemehuevi Indian Tribe Town of Wickenburg Salt River Project Agricultural Improvement and Power District Unit “B” Irrigation and Drainage District Conservation Participant Group Wellton-Mohawk Irrigation and Drainage District Yuma County Water Users’ Association Ducks Unlimited Yuma Irrigation District Lower Colorado River RC&D Area, Inc. Yuma Mesa Irrigation and Drainage District The Nature Conservancy Other Interested Parties Participant Group QuadState Local Governments Authority Desert Wildlife Unlimited Lower Colorado River Multi-Species Conservation Program Lowland Leopard Frog and Colorado River Toad Distribution and Habitat Use in the Greater Lower Colorado River Ecosystem Prepared by: Taylor B. Cotten and Daniel J. Leavitt Arizona Game and Fish Department Wildlife Contracts Branch 5000 West Carefree Highway Phoenix, Arizona 85086 Lower Colorado River Multi-Species Conservation Program Bureau of Reclamation Lower Colorado Region Boulder City, Nevada http://www.lcrmscp.gov June 2014 Cotten, T.B. and D.J. Leavitt. 2014. Lowland Leopard Frog and Colorado River Toad Distribution and Habitat Use in the Greater Lower Colorado River Ecosystem. Report submitted for the Lower Colorado River Multi-Species Conservation Program, Bureau of Reclamation, Boulder City, Nevada, under Cooperative Agreement No. R10AC30006, by the Arizona Game and Fish Department, Wildlife Contracts Branch, Flagstaff, Arizona. ACRONYMS AND ABBREVIATIONS AICc Akaike’s information criterion (small sample size) ANOSIM analysis of similarity Bill Williams River NWR Bill Williams River National Wildlife Refuge BLM Bureau of Land Management Cibola NWR Cibola National Wildlife Refuge DFA discriminant functions analysis DNA deoxyribonucleic acid eDNA environmental deoxyribonucleic acid GIS Geographic Information System Havasu NWR Havasu National Wildlife Refuge Imperial NWR Imperial National Wildlife Refuge LCL lower confidence level LCR lower Colorado River LCR MSCP Lower Colorado River Multi-Species Conservation Program MANOVA multivariate analysis of variance PCoA principal coordinates analysis UCL upper confidence level USGS U.S. Geological Survey Symbols Δ difference ≥ greater than or equal to < less than ≤ less than or equal to CONTENTS Page Abstract ................................................................................................................... v Introduction ............................................................................................................. 1 Study Area .............................................................................................................. 2 Objective 1 – Locate Potential Habitat for Lowland Leopard Frogs and Colorado River Toads Along the Lower Colorado River ................................. 2 Methods............................................................................................................. 2 Results ............................................................................................................... 5 Discussion ......................................................................................................... 6 Objective 2 – Determine the Distribution of Lowland Leopard Frogs and Colorado River Toads Within the Study Area .................................................. 9 Methods............................................................................................................. 9 Funnel Trap Arrays ..................................................................................... 9 Visual Surveys ............................................................................................ 9 Nocturnal Manual Call Surveys ................................................................ 11 Environmental DNA ................................................................................. 11 Results ............................................................................................................. 11 Discussion ....................................................................................................... 18 Objective 3 – Collect Genetic Samples from Lowland Leopard Frogs and Colorado River Toads ..................................................................................... 19 Methods........................................................................................................... 19 Results ............................................................................................................. 20 Objective 4 – Determine Habitat Selection for Lowland Leopard Frogs and Colorado River Toads Along the Lower Colorado and Bill Williams Rivers ....................................................................................... 20 Methods........................................................................................................... 20 Analysis: Logistic Regression.................................................................. 22 Analysis: Gradient Analysis .................................................................... 22 Results ............................................................................................................. 23 Local-Scale Habitat Selection: Logistic Regression ................................ 23 Regional-Scale Habitat Selection: Logistic Regression .......................... 26 Gradient Analysis...................................................................................... 28 Discussion ....................................................................................................... 34 Recommendations ................................................................................................. 36 Continue Habitat Use Study............................................................................ 36 Impacts of Flooding ........................................................................................ 37 Habitat Improvement and Monitoring ............................................................ 38 Literature Cited ..................................................................................................... 39 Acknowledgments................................................................................................. 45 i Tables Table Page 1 Summary of findings from funnel trap captures, manual call surveys, and dip net visual encounter surveys. ............................... 13 2 Summary of findings for positive and negative detections of eDNA where RAYA (lowland leopard frog) detections were observed .......................................................................................... 18 3 Local abiotic candidate models used to evaluate habitat use by lowland leopard frogs within Reaches 7 and 8 of the Bill Williams River ......................................................................... 23 4 Local biotic candidate models used to evaluate habitat use bylowland leopard frogs within Reaches 7 and 8 of the Bill Williams River ......................................................................... 24 5 Local predator candidate models used to evaluate habitat use by lowland leopard frogs within Reaches 7 and 8 of the Bill Williams River ......................................................................... 24 6 Local combined candidate models used to evaluate habitat use by lowland leopard frogs within Reaches 7 and 8 of the Bill Williams River ......................................................................... 25 7 Model averaged estimates and standard errors for parameters included in logistic regression combined local models .................. 26 8 Regional abiotic candidate models used to evaluate habitat use by lowland leopard frogs within Reaches 7 and 8 of the Bill Williams River ......................................................................... 26 9 Regional biotic candidate models
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